/*
* Copyright 2009 Andrew Pietsch
*
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You may
* obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing permissions
* and limitations under the License.
*/
package com.dragome.forms.bindings.client.condition;
import java.util.List;
import com.dragome.forms.bindings.client.function.Reduce;
import com.dragome.forms.bindings.client.value.ReducingValueModel;
import com.dragome.forms.bindings.client.value.ValueModel;
/**
* Created by IntelliJ IDEA.
* User: andrew
* Date: Jul 20, 2009
* Time: 12:09:09 PM
* To change this template use File | Settings | File Templates.
*/
public class ValueEqualsCondition<T> extends ReducingValueModel<Boolean, T> implements Condition
{
public ValueEqualsCondition(ValueModel<T> sourceA, ValueModel<T> sourceB)
{
super(new EqualsFunction<T>(), sourceA, sourceB);
}
public Condition and(ValueModel<Boolean> condition, ValueModel<Boolean>... others)
{
return Conditions.and(this, condition, others);
}
public Condition or(ValueModel<Boolean> condition, ValueModel<Boolean>... others)
{
return Conditions.or(this, condition, others);
}
public Condition not()
{
return Conditions.isNot(this);
}
private static class EqualsFunction<T> implements Reduce<Boolean, T>
{
public Boolean compute(List<? extends T> source)
{
T a= source.get(0);
T b= source.get(1);
return a == null ? b == null : a.equals(b);
}
}
}